In mammalian eye, the 'fovea' is the centre of the visual field, where

Options

A. High density of cones occur, but has no rods
B. The optic nerve leave the eye
C. Only rods are present.
D. More rods than cones are found

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Eye**: The mammalian eye consists of several key components including the cornea, lens, retina, and the optic nerve. Each part plays a crucial role in vision.

2. **Identifying the Retina**: The retina is the innermost layer of the eye where light is converted into neural signals. It contains photoreceptor cells known as rods and cones.

3. **Differentiating Rods and Cones**: Rods are responsible for vision in low light conditions and do not detect color, while cones are responsible for color vision and function best in bright light.

4. **Fovea Centralis**: The fovea is a small pit located in the macula lutea of the retina. It is known as the area of highest visual acuity.

5. **Characteristics of the Fovea**: The fovea contains a high density of cones and is devoid of rods. This unique structure allows for sharp central vision, making it the center of the visual field.

6. **Conclusion**: Therefore, in the mammalian eye, the fovea is the center of the visual field where a high density of cones occurs but has no rods.

### Final Answer:
In the mammalian eye, the fovea is the center of the visual field where a high density of cones occurs but has no rods.

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